GT2871R on RB20

[FLYSKY]

anybody have some exp. with the GT2871R on the RB20DET?
and does somebody know if it is also available with a T3 flange or would it be better to get a HKS Turbine housing that have the T3 flange?

thinking of the .64ar and lookin for ~ 380 - 450hp

[FLYSKY]

i think that i'll take the GT2871R - 472560 - 15 for my RB20 with 4" anti surged compressor housing, hks turbine housing with t3 flange (.64ar) and hks actuator, still not sure when i'll buy it but if i do i'll let u know how's its on a RB20

[Skym]

I think this is close to HKS GTRS on compressor side (T3 flange) for 200-420hp -

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT32/GT3271_452203_1.htm

It's the closest that I can see to HKS GTRS for Skyline flange with a bigger exhaust A/R, bigger exhaust wheel and is oilcooled, not watercooled.

I think this turbo is used on RB25DET for 310-525hp (T3 flange) -

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT30/GT3076R_700382_12.htm

I think this is the SR20DET / 400hp GTRS turbo for 280-460hp (T25 flange)-

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2871R_771847_1.htm

I think this is the RB26 / GTRS turbo for 280-475hp (T25 flange) -

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2871R_707160_10.htm

N1 R34 GTR (T25) -

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2860R_707160_7.htm

[FLYSKY]

the GT32 i've got be4 but sold it 'coz needed the money and it was too much work needed to get that turbo workin well on the RB20 and would run good with ~ 300 - 325hp from what i see on the compressor map.

the GT3076R seems to be great for 350 - 450hp but won't it have much more lag than the GT2871R Turbo?

those R34 GTR N1 turbo's seems to make a fast spooling car but could only support up to 300hp

so the best choice should be the GT2871R i guess for the power i want but what i dont know is from what rpm it starts to spool and when will it get the full boost pressure on the RB20DET.

dont want to change too much on the engine, just bigger intercooler, (try to find a cheap used GTR cooler or get one of those new 500x300x65mm intercoolers that i can get here for ~150 cad), 550cc injectors and a nistune ecu (what i've already installed is a 3" catback, boost controller, oil cooler with thermostat and 255l/h fuel pump from treperformance), if needed i think that i'll take oil and water pump from N1

[Skym]

Stock GTR intercooler should be better flowing than most cheap intercoolers.

Read this about intercoolers -

http://www.are.com.au/techtalk/intecoolersMR.htm

He has results of flow test's, etc.

From what I understand stock waterpump is best for road use due to N1 waterpump is not so good at keeping engine coolant temps down while car is in stop and start traffic (idling alot). N1 waterpump is more for racetrack use to reduce cavitation, air bubbles in cooling system at higher rpm's and for thicker radiators. But N1 oilpump is ok for road use.

I think Garrett GT3076R Turbo can run an internal wastegate (optional exhaust housing) for stock exhaust manifold. The .82R exhaust housing seems to suit RB25DET stock exhaust manifold, engine. Also I think there's a antisurge compressor housing.

The optional T3 exhaust housing (internal wastegate) can be bought here (.63, .82, 1.06) -

http://www.atpturbo.com/

Scroll down till you see "Internally Wastegated Options for GT30R & GT35R".

Then they have the flange for dumppipe -

http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=ATP-FLS-075&Category_Code=FLS

Also have the equivalent turbo to HKS 25/40 turbo with a few exhaust housing options -

http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GRT-TBO-003&Category_Code=GRT

RB20DET on dyno with Garrett GT3076R turbo -

http://www.youtube.com/watch?v=X_mibuiFSuk

The car in videoclip above has similar mods to what you are thinking of fitting to your car (550cc injectors, etc).

[BurlyR32]

As far as I can see, the GT2871R is the perfect turbo for a stock RB20. A guy around here has one on his SR with stock internals and it seems to be a perfect match. Runs about 330whp with very minimal lag. The 3071 is more suited to an RB25, making the 2871 a logical choice for the RB20. Its the turbo I was going to get for my GTS before I sold it. Look up posts by "happy240sx" on Off Topic and you will find his build with dyno charts.

[jessem]

could 330whp be expected on a rb20 though? SRs seem to have higher power with them, i would love to run a 2871 .86 ar but i didnt think it would give me the horsepower i wanted (~350whp)

[Skym]

The SR20's probably have cams to suit the GT2871R turbo. Cams help to produce more hp at the same boost level (increases engine hp). Drop in 256 duration 8.5mm lift Tomei Poncams gives a 24hp bump in hp at same boost level when ECU is tuned to suit on RB20DET. More aggressive cams or dialing in cams with adjustable cams gears makes engine produce more hp and turbo's reach fullboost at lower rpm's (500rpm or so) earlier while running same boost level.

From what I can remember, SR20's run HKS 264 duration intake, 256 duration exhaust cams, which works with HKS GTRS turbo (common setup on SR powered S15 drift cars). That setup can produce around 380rwhp (roughly 444hp at engine) at a high boost setting on SR20. There are similar spec cam upgrades available from HKS for RB20DET.

To take full advantage of a turbo upgrade, cams, injectors, fuelpump, MAF need to be fitted at the same time and ECU retuned.

[jessem]

I think a 3071 would suit a rb20 well, what kind of rpm is a sr20 spooling the 2871s up at? my rb25 turbo hits 14psi fairly late im gonna say just under 4000 maybe, so whats another 500 rpm to have 18ish psi and possibly 100 more hp. dont get me wrong though for a street car lag is everything but to make the big figures the boost will need to be at a higher level as skym said, so it does take a while to build all that pressure up.

[Skym]

Depends on exhaust A/R, exhaust wheel size. The car mentioned above was around 4000rpm with GTRS turbo, low mount exhaust manifold, FMIC, cams, ECU, etc.

This is a boost graph comparison between HKS GTRS with 0.64 exhaust housing and GT2871R with 0.86 exhaust housing on SR20DET -

http://3.bp.blogspot.com/_vhpEGyEVhes/R_voV_TqEqI/AAAAAAAAApg/p6HV8CHEpKQ/s1600-h/S14+GTRS+%26+2871R+.86+BOOST.jpg

HP increase -

http://2.bp.blogspot.com/_vhpEGyEVhes/R_voVvTqEpI/AAAAAAAAApY/xeJu5xH2S9I/s1600-h/S14+GTRS+%26+2871R+.8.jpg

HKS GTRS has a 0.64 exhaust housing -

http://www.hks-power.co.jp/products/turbo/hanyo/turbinesho.html

HKS turbo's are designed to work with stock / modified engine and have a few mods like polishing compressor housing, slightly bigger compressor wheels, etc that make them produce slightly more hp. You can do similar mods to off the shelf Garrett turbo's, if turbo rebuilder is experienced enough and knows these tricks.

It's similar to RB25DET with bolt on internally gated GT3076R (stock RB25DET wastegate actuator) to stock exhaust manifold with 0.82 exhaust housing and without boost controller.

[M13]

Update on my 3071R on my 20.

Spools quick at 3600 ish and hits like a train. The 90mm TB with front facing plenum makes the engine so responsive!!

[jessem]

Update on my 3071R on my 20.

Spools quick at 3600 ish and hits like a train. The 90mm TB with front facing plenum makes the engine so responsive!!

thats what i like to hear!
makes me want a 3071, what AR?

[M13]

thats what i like to hear!
makes me want a 3071, what AR?

.50 AR on compressor with 4" inlet

.64 on turbine I believe.

Mind you I also have ported head with front facing plenum (with 90mm TB).

[Skym]

Stock exhaust manifold??

[M13]

Stock exhaust manifold??

nope, top mount with T28 inlet flange, unequal length runners and 38mm TiAL waste gate.